But you who seek to give and merit fame,
And justly bear a Critic's noble name,
Be sure yourself and your own reach to know,
How far your genius, taste, and learning go;
Launch not beyond your depth, but be discreet, 50
And mark that point where sense and dulness meet.

Nature to all things fix'd the limits fit,
And wisely curb'd proud man's pretending wit.
As on the land while here the ocean gains,
In other parts it leaves wide sandy plains; 55
Thus in the soul while memory prevails,
The solid pow'r of understanding fails;
Where beams of warm imagination play,
The memory's soft figures melt away.
One science only will one genius fit; 60
So vast is art, so narrow human wit:
Not only bounded to peculiar arts,
But oft in those confin'd to single parts.
Like kings we lose the conquests gain'd before,
By vain ambition still to make them more; 65
Each might his sev'ral province well command,
Would all but stoop to what they understand.

First follow Nature, and your judgment frame
By her just standard, which is still the same:
Unerring NATURE, still divinely bright, 70
One clear, unchang'd, and universal light,
Life, force, and beauty, must to all impart,
At once the source, and end, and test of Art.